Door-check.



T. S. GRISELL.

000R CHECK.

APPLICATION FILED MAR.31,1916.

Patented Sept. 12, 1916.

Inventor Witnesses I Attorneys UNITED STATES THOMAS S. GRISELL, 0F WALDO, KANSAS.

DOOR-CHECK.

Application fiIedM arch 31, 1916. Serial No.

To all whom it may concern:

Be it known that I, THOMAS S; GRIsELL, a citizen of the United States, residing at Waldo, in the county of Russell and State of Kansas, have invented a new and useful Door-Check, of which the following" is a specificatio This invention relates to door checks of that type utilizing a pneumatic cushion for retarding the closing of the door.

One of the objects of the invention is to provide a novel arrangement of springs and levers whereby the door will be held closed with considerable pressure, the pressure exerted by the springs upon the door gradually diminishing as the door is opened.

A further object is to provide a device of this character which is simple in construction and the parts of which will not readily get out of order.

Another object is to provide a door check which can be reversed for use in connection with either a right hand door or a left hand door.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, can be made within the scope of what is claimed, without departing from the spirit of the invention.

In the accompanying drawings the preferred form of the invention has been shown.

In said drawings: Figure 1 is a plan view of a door check embodying the present improvements, the relative positions of the parts when the door is partly opened, being indicated by dotted lines. Fig. 2 is a front elevation of the structure shown in Fig. 1.

Referring to the figures by characters of reference 1 designates a bracket adapted to be secured to the upper portion of a door D and having outstanding ears 2 at the top and bottom thereof in which a pin 3 is mounted for rotation, this pin having its ends projecting beyond the ends of the bracket and said projecting ends being angular as indicated at 4:. Each projecting end is provided with an opening 5 for the reception of a cotter pin 6 or the like. A coiled spring 7 extends around the pin andoneend of the spring bears against the bracket 1 Specification of Letters Patent.

Patented Sept. 12,1916. 8 8,025.

whilethe other end is attached in any suitable manner to the pin. Another similar bracket, indicated at 8, is adapted to be secured to the door casing above the door opening and this bracket has ears 9 extending from the upper and lower'ends thereof. A pin 10 is journaled within the ears and has angular projecting'ends 11. A spring 12 is mounted on the pin and bears at one end against the bracket and is secured at its other end to the pin. Each projecting end of the pin has an opening 13 therein for the reception of a cotter pin or the like as shown at 14'.

Extending from the casing C at a point between the two brackets 1 and 8 when said brackets are in their normal positions, is a bracket 14 to which is pivotally connected one end of a cylinder 15 in which a piston, not shown, is mounted for reciprocation, this cylinder being provided with a suitable air vent indicated generally at 16 and which is designed to be so regulated as to retard the escape of air and thus' provide an air cushion back of the piston when the door is brought close to its shut position. The rod 17 of the piston is adjustably connected to an arm 18 extending laterally from one end of a rod "19. This rod is preferably made up of two alining threaded sections connected by a turn buckle20 so that it is thuspossible to lengthen or shorten the rod. That end of the rod remote from the arm 18 is provided with an angular openingadapted to receive the lower end of the pin 10 and to be held thereon by a cotter pin 14:" or the like. Pivotally mounted within the rod 19 close to the arm 18 is the upturned end 21 of a rod 22 which rod has an angular opening designed to receive the upper end 4 of the pin 3 and to be held thereon by a cotter pin 6 or the like. This rod 22 can belengthened or shortened inasmuch as it is formed of alining sections connected by a turn buckle 23. The spring 12 is so positioned on the pin 10 as to press the rod 19 constantly in the direction indicated'byarrow a inFig. 1. The spring 7 on pin 3 is so disposed as to press the rod 22 constantly in the direction indicated by arrow Z; in Fig. 1. Thus the two springs acting together serve to press the door D to its closed position, spring 12 thrusting rod 19 against the outer end of rod 22 and pushing said rod toward the door, While spring 7 presses backwardly against the bracket 1 and acts as a supplemental means for holding the door tightly shut.

It will be apparent that when the door D is swung open it will press through rod 22 against rod 19 and rod 22 will be caused to swing relative to the door, thus rotating the pin 3 against the action of its spring 7. Rod 19 will also be swung so as to rotate pin 10 against the action of its spring 12. At the same time the arm 18 will pull away from the cylinder 15 so that rod 17 will pull its piston longitudinally within the cylinder. As the door moves open the pin 3 travels farther away from the pin 10 and a gradually increasing leverage upon the two springs is obtained, with the result that less power is required to open the door as said door approaches its full open position. When the door is released the two springs 7 and 12 are brought into play and operate simultaneously to swing their respective rods 22 and 19 to their respective normal positions. This results in the door swinging toward its closed position with considerable speed until it has arrived at a point close to casing C whereupon the air which is trapped in cylinder 15 and in the path of the piston in said cylinder will act as a cushion to gradually retard the door so that it will shut without slamming. When the door is once closed the two springs will exert their full force thereagainst in the manner hereinbefore pointed out, thus holding the door in shut position unless extreme force is exerted. Consequently the door will remain shut without latching it, even though Copies of this patent may subjected to a considerable wind pressure. As a result the device herein described is especially useful upon doors of stores and the like.

As has been pointed out heretofore, the device can be used in connection with either left hand or right hand doors, it merely being necessary to invert the parts 1 and 8 and to reverse the other parts of the apparatus.

That is claimed is In a door check the combination with a bracket for attachment to a door, and a sec ond bracket for attachment to a door casing, said brackets being reversible, of a pin mounted for rotation within each bracket and having angular projecting terminals, an air cushion for pivotal attachment to a door casing and including a cylinder and a piston rod, a rod detachably connected to one end portion of one of the brackets and having a laterally extending arm pivotally engaged by the piston rod, another rod detachably engaging one end of the pinon the other bracket and pivotally connected to the rod upon the other bracket, and springs connected to the respective pins and brackets for normally pressing the rods in one direction to maintain a door in closed position.

In testimony thatI claim the foregoing as my own, I have hereto afiiXed my signature in the preseTnce of two witnesses.

HOMAS S. GRISELL.

Witnesses:

G. H. Gnoss, L. J. MILLER.

Commissioner of Patents.

Washington, .D. 0. 

